1. Ch. 2-2 Physical Properties of Matter

2. Physical Properties – a property of matter that can be observed without changing the matter's identity.
We use physical properties everyday to identify different types of matter

3. Examples: Color Size Odor Shape Hardness
Texture (soft, smooth, or rough)
Luster (metallic, glassy, shiny, dull)
State – the physical form in which a substance exists
Conductivity – the ability to conduct electricity or heat

4. More Examples:
Melting Point - the temperature at which the solid melts to become a liquid
Boiling Point – the temperature at which a liquid starts to boil

5. Malleability – the ability of a substance to be pounded or rolled into thin sheets
ex. – tin foil
Ductility – the ability of a substance to be stretched or pulled into a wire
ex. - copper stretched into a wire

6. Mass – the amount of matter in an object
Volume – the amount of space taken up by an object
Density – the amount of matter in a given space or volume

7. Formula for calculating Density:v

8. Sample Problem:
A baseball has a mass of about 150 g. It's volume is 50 cm3. What is it's density?

9. Answer:
150 g divided by 50 cm3 = g / cm3

10. Sample Problem:
What is the volume of a brick with a length of 30 cm, a width of 15 cm, and a heigth of 8 cm?
(Hint – L x W x H )

11. Answer:
30 x 15 x 8 = cm3

12. Physical Change – a change that affects one or more physical properties of a substance
Examples :
A popcicle melting (solid to a liquid)
Crushing a metal can
Making wood chips from a piece of wood
Dissolving sugar in iced tea